<template>
  <div>
    <table
      border="1"
      width="700"
      style="border-collapse: collapse"
    >
      <caption>
        购物车
      </caption>
      <thead>
              <th>
    <input type="checkbox" v-model="checkAll" /> <span>全选</span>
    </th>
    <th>名称</th>
    <th>价格</th>
    <th>数量</th>
    <th>总价</th>
    <th>操作</th>   
      </thead>
      <tbody>
        <mytr v-for="(item,index) in goodList" :key="index" :person="item" @delperson="del(index)" ></mytr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:{{total}}</td>
          <td colspan="5">
            
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import mytr from "./components/mytr.vue"
export default {
    methods:{
        del(index){
            this.goodList.splice(index,1)

        }
    },
    computed:{
        checkAll:{
            set(val){
                this.goodList.forEach(item=>item.checked=val)
            },
            get(){
                return this.goodList.length!=0 &&this.goodList.every(item=>item.checked==true)
            }
        },
        total(){
            return this.goodList.reduce((sum,item)=>{
                if(item.checked ==true){
                    sum+=item.price*item.num
                }
                return sum;
            },0)
        }
    },
     components:{
      mytr},
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
};
</script>

<style>
</style>